I have seen these post for enabling MMS. question,
why do I need to put the codes in mms. Isn't that for text messaging. I think I'm paying for this service now. Does this allow for another function? Am I missing something?

I pay 49.99 for unlimited minutes and 5.00 I think for 300 mins.
this is what I have:

In addition to the shared plan and services on this account (detailed above), this line also has the following services:
Any 300 Domestic Messages
Unlimited Web for phones

ok I found through google search, that this approach for enabling MMS is to allow me to send video and picture. I have not use the text with pictures feature, so I didn't know you could not do, though my adult children were well aware of it. So this look like a good thing to do to increase my cell phone functionality. Cydia offers a lot, but I very slow in learning about all this power available to the iphone.